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Forging method for improving lateral impact performance of steel material

A technology of transverse impact and high performance, which is applied in the forging field of steel and improves the transverse impact performance of steel. It can solve the problems of low transverse impact and unstable transverse and longitudinal mechanical properties of bars, and achieve high transverse impact energy and isotropy. and the effect of improving the uniformity of the transverse and longitudinal structures and refining the grains

Active Publication Date: 2015-03-11
XINING SPECIAL STEEL
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, this type of steel produced in China has the problems of low transverse impact of bars and unstable transverse and longitudinal mechanical properties.

Method used

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  • Forging method for improving lateral impact performance of steel material
  • Forging method for improving lateral impact performance of steel material
  • Forging method for improving lateral impact performance of steel material

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Embodiment Construction

[0032] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0033] 1. Remelting of electroslag ingot

[0034] The blank adopts Ф240mm forged consumable electrode blank.

[0035] The heavy melting slag is pre-melting slag, and the amount of slag is 65kg.

[0036] Deoxidizer: CaC 2 300g, 300g of Al powder, and 250g of Ca-Si powder are mixed evenly, and 100g of deoxidizer is added for every 120kg of consumable electrode blank.

[0037] The remelted ingot shape is Ф430mm, the electroslag ingot is sawed at both ends, and the ingot height is controlled at 700-800mm.

[0038] Power system: voltage 68-70V, current 8500±500A.

[0039] Melting speed control: 3.5kg / min-4.0kg / min.

[0040] Electroslag remelting equipment: 10t double-arm exchange electrode electroslag furnace.

[0041] During the electroslag remelting process, an automatic feeder is used to evenly add powdered deoxidizer to the crystalli...

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Abstract

The invention discloses a forging method for improving the lateral impact performance of a steel material. The forging method is characterized by comprising the following steps: (1) remelting an electroslag ingot; (2) producing forged steel by electroslag ingot forging, wherein the step of producing the forged steel by the electroslag ingot forging comprises the following steps:1) firstly, heating the electroslag ingot, and then, carrying out forging cogging according to a two-tampering two-pulling technology; (2) annealing a process blank; (3) after the process blank is heated and kept warm, forging a production material, wherein the total forging ratio of the production material is controlled to be above 4.0. The forging method has the beneficial effects that the electroslag ingot is subjected to single-pass big-reduction two-tampering two-pulling forging cogging, the isotropy and the lateral and longitudinal tissue evenness of the steel material can be drastically improved since tampering pulling forging is carried out for multiple times before the production material is forged, and the lateral performance of the steel material is drastically improved while the longitudinal performance of the steel material is not lowered. Since remelting heating heat insulation is carried out immediately when the forging pulling is finished one time, a forging pulling blank restores recrystallization by remelting so as to be favorable for next-time tampering pulling forging and grain refinement.

Description

technical field [0001] The invention relates to a forging method of steel, in particular to a forging method for improving the transverse impact performance of steel, and belongs to the technical field of forging technology. Background technique [0002] The steel used for the long blades of the second last stage of an ultra-supercritical steam turbine unit has high requirements on the transverse mechanical properties and the ratio of transverse and longitudinal mechanical properties of the bar in the technical specifications of the steel. However, at present, this type of steel produced in China has the problems of low transverse impact of bars and unstable transverse and longitudinal mechanical properties. [0003] Therefore, in view of the above problems, it is necessary to develop a forging method that can effectively improve the transverse impact performance of steel. Contents of the invention [0004] The purpose of the present invention is to provide a forging meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21J5/06B21J1/06C22B9/18
Inventor 陈列佐辉甄建才李俊儒寇玉山钱财让晁智勇
Owner XINING SPECIAL STEEL
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